Question

The conversion of maltose to glucose is possible by the enzyme :

• A. zymase
• B. lactase
• C. maltase
• D. diastase

Answer 1

Answer: (C)

Maltose also known as malt sugar is a reducing sugar and gives two molecules of $\alpha$-D-glucose upon hydrolysis. In it two glucose molecules are joined by $\alpha$-glycosidic linkage between $C_1$ of the first unit and $C_4$ of the second unit
$\text{maltose}\stackrel{\text{maltase}}{\to }\alpha -D-$ giucose $\alpha -D-$ glucose
whereas :
$\underset{\text{Glucose}}{C_6{H}_{12}{O}_6}+\underset{\text{(from yeast)}}{\overset{\text{ zymase }}{\to }}2C_2{H}_{5}OH+2C{O}_2$
lactose is found in milk of mammals
lactose $\stackrel{\text{ lactase }}{\to }$ D-glucose $+$ D-galactose
Diastase is used to digest starch